Method of preparing raw material powder for permanent magnets su

Details Method of preparing raw material powder for permanent magnets su Method of preparing raw material powder for permanent magnets su

1998-07-09

2000-08-15

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

75348, 75349, B22F 900

Patent

active

06103021&

ABSTRACT:
The present invention is directed to provide a method of preparing a raw material powder for permanent magnets superior in moldability, especially in moldability and productivity of bonded magnets. The method comprises subjecting an acicular iron powder having an aspect ratio of not smaller than 5:1 to heating at 800-900.degree. C. in fluidized state with a gas stream containing no oxygen until the acicular iron powder is transformed into a columnar shape iron powder having an aspect ratio of not larger than 3:1, a die-like shape iron powder or a spherical shape iron powder. The acicular iron powder may contain or may be attached by such a component effective for improving magnetic properties as a rare earth element metal, a rare earth element metal oxide, boron, cobalt and nickel.

REFERENCES:
patent: 5849109 (1998-12-01), Ikeda
patent: 5865873 (1999-02-01), Sekine et al.

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